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DTC 01-21 ROM Error; DTC 01-22 RAM Error: Description

WARNING: This page is about a different car, the 2008 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
DTC TROUBLE DETECTION CONDITION CHART

DTC Code DTC Detection Condition Trouble Area
01-21 A malfunction exists in ROM. Radio receiver assembly
01-22 A malfunction exists in RAM.
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